When I use the Gmail menu function Create event, it creates a Google Calendar event from the information of the Gmail conversation. However, as you can see in the screenshots below, it does not show all my available calendars. How can I make all my calendars available?
Available calendars in Create event dialog:
All my calendars:
When you create a new event only main Google Calendar is available. In your case, it looks like "Agenda". Save the event in main calendar and then edit saved event - list of calendars will be available. Choose required calendar from the list. Unfortunately, there are no other ways to do it. Please, see more information by link: https://productforums.google.com/forum/#!topic/calendar/91fFeFYOciA;context-place=topicsearchin/calendar/gmail
